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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2012
Summary of Stock-Based Compensation Expense | The following table summarizes stock-based compensation expense (in thousands):
|  | Year ended December 31, |
|  | 2012 |  |  | 2011 |  |  | 2010 |
Employee stock-based compensation in: |  |  |  |  |  |  |  |  |  |  |  |
Cost of revenue |  | $ | 2,996 |  |  | $ | 3,075 |  |  | $ | 2,197 |
Research and development expense |  |  | 6,405 |  |  |  | 6,926 |  |  |  | 5,013 |
Selling, general and administrative expense |  |  | 9,525 |  |  |  | 10,912 |  |  |  | 8,329 |
Total employee stock-based compensation recognized in income (loss) |  |  | 18,926 |  |  |  | 20,913 |  |  |  | 15,539 |
Amount capitalized in inventory |  |  | — |  |  |  | — |  |  |  | 10 |
Total stock-based compensation |  | $ | 18,926 |  |  | $ | 20,913 |  |  | $ | 15,549 |
Valuation Assumptions for Stock Options | The Company estimated the fair value of all employee stock options using a Black-Scholes valuation model with the following weighted average assumptions:
|  | Employee Stock Options |
|  | 2012 |  |  | 2011 |  |  | 2010 |
Expected term (in years) |  |  | 4.70 |  |  |  | 4.75 |  |  |  | 4.75 |
Volatility |  |  | 56 | % |  |  | 55 | % |  |  | 56 | %
Risk-free interest rate |  |  | 0.9 | % |  |  | 1.8 | % |  |  | 2.4 | %
Dividend yield |  |  | 0.0 | % |  |  | 0.0 | % |  |  | 0.0 | %
Employee Stock Purchase Plan | The call option and put option were valued using the Black-Scholes option pricing model with the following assumptions:
|  | Employee Stock Purchase Plan |
|  | 2012 |  |  | 2011 |  |  | 2010 |
Expected term (in years) |  |  | 0.50 |  |  |  | 0.50 |  |  |  | 0.50 |
Volatility |  |  | 49 | % |  |  | 45 | % |  |  | 46 | %
Risk-free interest rate |  |  | 0.2 | % |  |  | 0.2 | % |  |  | 0.4 | %
Dividend yield |  |  | 0.0 | % |  |  | 0.0 | % |  |  | 0.0 | %

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- Definition Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph g(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 64 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=6793087&loc=d3e301413-122809 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of employee stock purchase plans, including, but not limited to: (a) expected term, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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